Guard for carding engines



4 Sheets-Sheet 1,

INVENTOR.

ciooJmm 4 my \w n Sept. 27, 1932. J. PICKFORD GUARD FOR CARDING ENGINESFiled July 31, 1930 Se t. 27, 1932.

J. PICKFORD GUARD FOR CARDING ENGINES Filed July 31, 1930 4 Sheets-Sheet2 I I IIIHII INVENTOR.

1932- J. PICKFORD 1,879,764

GUARD FOR CARDING ENGINES Filed July 31, 1936 4 Sheets-Sheet 5 INVENTOR.

Sept. 27, 1932. HCKFORD 1,879,764

GUARD FOR CARDING ENGINES Filed July 31, 1930 4 Sheets-Sheet 4 INVENTOR.

Patented Sept. 27, 1932 PATENT OFFICE Jane s ncxronn, or OLDHAM, ENGLANDGUARD FOR CARDIN'G ENGINES Application filed July 31, 1930, Serial. No.472,144, and in Great Britain August 15, 1929.-

f This invention relates to improvements in mechanism for locking thedoors of carding engines such mechanism being of the type in which theopening of the door is controlled 5 by a sliding bar which is locked bya loose disc or roller situated in a stationary casing and maintainedjust clear of the cylinder so that when the latter is in rotation itcannot be moved to unlock the bar, such unlocking being only possiblewhen the cylinder is at rest.

In mechanism ofthis type as hitherto constructed the locking roller ordisc was wholly encased within the stationary casing and was operated bya' second loose roller or disc arranged in the same plane asthe lockingroller or disc and. engaging the periphery thereof. This loose roller ordisc projected through the front of the casing so that when the cylinderwas at rest the rotation of the loose roller caused the locking rollerto rotate and rise out of engagement with the sliding bar so that thelatter was free to slide longitudinally and the door of the cardingengine could be unlocked. I

A disadvantage of such locking mechanism lay in the fact that it waspossible for the device to be operated when the cylinder was rotatingand another disadvantage lay in the fact that it was only applicable tocertain types of carding engine since the strap obstructing bar, whichprevents the driving belt from being moved on to the fast pulley untilthe cylinder door is closed, was mounted on the stationary casing. atthe side adjacent to the pulley. A further disadvantage lay in the factthat if the locking roller was set too far away from the side ofthe'cylinder it did not lock the bar.

The object of the present invention is to provide a simpler constructionof locking device which cannot be operated when the cyl-- inder isrotating and which will permit of the strap obstructing bar beingpivoted on the side of the casing remote from the pulley so that thedevice can be applied to any type of carding engine.

The invention consists of a single locking roller or disc located in acasing having an aperture above the central axis of the roller or discsuch aperture being sufiiciently large to allow access to the peripheryof the roller by a finger or fingers only so that the roller or disccannot be gripped between the fingers, but when the cylinder is atrestit can be readily rotatedto cause it torise out of engagement withthe sliding bar.

The invention consists further in pivoting a cam member whichoscillatesthe strap obstructing rod on the side of the casing remote from thedriving pulley the end of the sliding bar being provided with a raisedor rampsurface to oscillate the cam when the bar is withdrawn, suchraised or ramp surface being in front of the surface on which the rolleror disc rests when it has been raised out of the locking aperture at thefront of the bar and the bar has been moved forward to the door to beopened.

By this construction of lockingdevice the sliding bar connects the armof the cylinder door directly to the casing and no additional bracketsor studs are necessary to carry the strap constructing bar. 7

The invention will be, described with reference to the accompanyingdrawings N Fig. 1 is side view of part of a carding en gine showing thecasing carrying the single locking roller bolted to the framing, theslid-- ing bar being in the position occupied when the door is open.

Fig. 2 is a section on line 2+2 Fig. I.

3 is a side elevation of part of a carding engine showing the casingbolted to the bend, the sliding bar being'in the positionoccupied whenthe dooris closed.

Fig. 4 is a section on line 44 Fig. 3.

Fig. 5 is a perspective view of easing, locking roller, end of one formof sliding bar and a strap obstructing rod. V

Fig. 6 is a perspective view of end of another form of sliding bar.

Fig. 7 is a vertical section through the easing and locking roller.

Fig. 8 is a section on line 77 Fig. 7 showing the casing bolted to thebend of the carding engine. V

The stationary casing B is bolted to the framing A of the carding.engine as shown mo in Figs. 1 and 2 or to the bend a as shown in Figs. 3and 4 according to the type of carding engine to which it is applied. Aloose roller C is located within the casing B and contactsat c with theside of the cylinder A In the form of the invention shown in Figs. 3 and4 the strap obstructing member G is of ordinary construction and isarranged on the side of the casing B adjacent to the fast and loosepulley.

In the form of the invention shown in Figs. 1 and 2 the member G ismounted on the side of the casing B remote from the fast and loosepulley, its construction and operation being hereinafter more fullydescribed.

An aperture 6 is formed in the front of the casing B such aperture beingabove the central axis'of the roller when the latter is in its lowest orlocking position, i. e. the position shown in Fig. 7. The periphery ofthe roller C is level with and projects a very short distance into theaperture 7) so that it can be engaged by the finger or fingers of theoperator but cannot be gripped between the fingers.

A transverse slot, groove or passage 6 is formed at the bottom frontedge of the easing B to form a guide and support for the sliding bar Dwhich is pivotally connected at itsend dwith the pivoted arm Esupportingthefcylinder door E Thefront end of the bar I) is formed with a recess(Z which is engaged by the roller G when the bar is in the lockingposition so that the bar cannot be moved until the roller G is rolledupwards to'raise'it out of the slot.

I When the strap obstructing member G is of ordinary construction and ismounted on the side of the casing B adjacent to the fast and loosepulley the recess 6Z1 extends across the bar D and as shown in Figs. 3and 4 the upper surface ofthe end of the bar is raised and is formedwith an incline cl so that after the roller Chas been raised it will notreturn to its original position as the bar Dis moved. The front end ofthe bar D engagesthe strap obstructing member G as the rod is moved tomove the member G into the obstructing position. I

When" the strap obstructing member G is located on the side of thecasing B remote from the fast andloose pulley the end of the bar D isconstructed as shown in Fig. 5 or Fig. 6 the recess (Z extending to thefront of the bar'D as shown in Fig. 5 or only part way across the end asshown in Fig. 6.

The bar D may be formed with two top surfaces (Z 6Z3 as shown in Fig. 5,the front surface d being the surface which engages and operates the camF which controls the strap obstructing bar G and the surface (Z beingthe surface against which the roller C rests after it has been raisedout of the recess d and the bar'D has moved into the unlocking position.The surface d comprises. a low surface (i with which the camengageswhen'the bar D is 'in the locking position, a

steep rise d which rotates the cam F as the bar is being moved and araised surface cl which holds the cam F in the position to cause thestrap obstructing member G to be in the position to prevent the strapbeing moved on to the fast pulley whilst the door is unlocked. Thesurface (2 has agradual downward slope (Z7 to the horizontal position (Zextending rearwardly of the bar so that after the roller C has beenraised the latter will gradually return to its bottom position as thebar D is moved forward from the looking to. the unlocking position.

In carding engines where there is only a limited space the-end of thebar D may be constructed as shown in Fig. Ginwhich construction thesurface d onlyextends to the end of the slope. d. This constructionallows the front surface of the 'rodandlthe strap obstructing member Gtobe brought further forward away from the side of the machine which'isnecessary for certain types of carding engines. .Two brackets orlugs bare formed on the side of the casing'B'r'emote from the driving pulleyand carrying a' short shaft 9 on which the strap obstructing bar G ismounted. A cam Fv is alsomounted on this shaft 9 which cam is inengagementwith the surface d of the sliding'bar D.

The construction of the end of the locking bar D as shown in Fi s. 5'orGensures that the roller O willalways lock the bar in what ever positionthe latter maybe set in relation tothe'side of the carding engine.

' The locking device operates as'followsz e lVhenthe door E is closedthe roller C is situated in the recess d at the end ofthe sliding bar.1) and the: cam F is in engagement with the low portionclof the surfacecZ so that the strap obstructing bar is in the position to allow thestrap to be moved on to'the fast pulley. If the cylinder A is rotatedthe frictional contact therewith of the roller C which would occur onany attempt by the operator to rotate the roller C, is too great toallowthe latter to be roated by a finger or fingers of the operator to causeit to be raised out of the recess (Hand.

accordingly the bar D is locked and the door E 'cannot be opened. v I

lVhen the cylinder A is at rest the roller (1 can be rotated by thefinger or fingers of the operator to cause it to roll on the cylinder Aand rise outof the recess (Z in thebar D and the bar can then slidethrough the casing B and allow the door E to be opened. This movement ofthe bar D causes the cam F to mount up the steep incline d andconsequently to rotate so that the shaft 9 rotates in the lugs b and thestrap obstructing bar G moves into the position to prevent the strapfrom being moved onto the fastpulley. The cam F and strap obstructingbar G in this position until the bar D has been returned 'to its lockingposition so that the strap cannot be moved on to the fast pulley and thecylinder rotated until the door E has been closed.

What I claim as my invention and desire 5 to protect by Letters Patentis 1. Guards for carding engines of the type referred to comprising thecombination with a pivoted arm and a door carried thereby of a barconnected to the pivoted arm, astationary slotted casing through whichthe bar slides, a locking roller engaging the bar and housed within thecasing to project therefrom at both ends and prevent movement of the barwhen the cylinder is rotating, a strap obstructing member and a camcarried-by the strap obstructing member to bear upon the bar, the strapobstructing member preventing movement' of the strap until the door isclosed. 2. Guards for carding engines of the type referred to comprisingthe combination with a pivoted arm and a door carried thereby of atransversely recessed bar, a stationary slotted casing through which thebar slides, a locking roller engaging the bar and housed within thecasing to project therefrom at both end-s and prevent movement of thebar when the cylinder is rotating, a strap obstructing member and a camcarried by the strap obstructing member to bear upon the bar the strapobstructing member preventing movement of the strap until the door isclosed.

3. Guards for carding engines of the type referred to comprising thecombination with a pivoted arm and a door carried thereby of atransversely recessed bar, a stationary slotted casing through which thebar slides, a locking roller engaging the bar and housed within thecasing to project therefrom at both ends, a strap obstructing member,bearings on the side of the casing, a shaft carried in said bearingsupon which the strap obstruc-ting member is pivoted and a cam on saidshaft to bear upon the bar.

4. Guards for carding engines of the type referred to comprising thecombination with a pivoted arm and a door carried thereby of atransversely recessed double surfaced bar, a stationary slotted casingthrough which the bar slides, a locking roller engaging the back surfaceon the bar and housed within the casing to project therefrom at bothends, a strap obstructing member, bearings on the side of the casing, ashaft carried in said bearings upon which the strap obstructing memberis mounted and a cam on said shaft bearing upon the front surface ofsaid bar.

In testimony whereof I have hereunto set 0 my hand.

7 JAMES PIGKFORD.

